package com.xuecheng.framework.exception;
import com.google.common.collect.ImmutableMap;
import com.xuecheng.framework.model.response.ResponseResult;
import com.xuecheng.framework.model.response.ResultCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * 异常捕获类
 */
@ControllerAdvice//使用 @ControllerAdvice和@ExceptionHandler注解来捕获指定类型的异常
public class ExceptionCatch {
    private static final Logger LOGGER= LoggerFactory.getLogger(ExceptionCatch.class);

    //使用EXCEPTIONS存放异常类型和错误代码的映射，ImmutableMap的特点的一旦创建不可改变，并且线程安全
    private static ImmutableMap<Class<? extends Throwable>,ResultCode> EXCEPTIONS;
    //使用builder来构建一个异常类型和错误代码的异常
    protected static ImmutableMap.Builder<Class<? extends Throwable>,ResultCode> builder =
            ImmutableMap.builder();

    @ExceptionHandler(CustomException.class)
    @ResponseBody
    public ResponseResult customException(CustomException e){
        LOGGER.error("catch exception : {}\r\nexception: ",e.getMessage(),e);
        ResultCode resultCode = e.getResultCode();
        return new ResponseResult(resultCode);
    }
}
